Iron chins, are you born with them or are they developed through training and fighting style?
Could it be that fighters that dont get accostumed to get punched in the face since they're kids are destined to become glass jawed frauds in the pro stage?
Mexican fighters are famous for the quality of their chins, they're also famous for their agressive style that disregards defense for attack, the typical mexican fighter gets hit a lot, yet he also posseses a great chin so he can be succesful with that style. Mexicans barely spend time in the amateurs so they get accostumed to get punched in the face since an early age in the pro stage.
mexican chin in display
On the other hand you have the cubans, most of them seem to possess fragile glass mandibles in the pro stage, they also tend to have very, very extensive amateur bgs, so they're accostumed to be protected by headgear most of their boxing lives. Cubans are proud of their skills, they dont like to get hit, and they dont get hit very often in the pros, but the moment they do, stuff like this happens:
cuban chin in display
So what do you think? are solid chins a genetic trait? are they a by-product of getting used to get punched in the face since an early age? or maybe a combination of both factors? what's the secret behind the Haglers, Chuvalos, McCalls of the world?